Direct Inward System Access (Disa) - Nortel Modular ICS 6.0 Installer's Manual

Direct inward system access (DISA)

To control access from the public or private network, you can
configure auto-answer trunks to answer with DISA. Remote
callers hear a stuttered dial tone and must then enter a COS
password. The password they enter determines what access
they are allowed in the system.
Auto-answer loop start and E&M trunks are configured to
answer with DISA by default. For DISA programming
instructions, see Ans with DISA on page 342.
Tips -
provide DTMF receivers for every two auto-answer loop start
trunks on Loop Start or CI Trunk Cartridges.
DID trunks cannot be configured to answer with DISA. If you
want incoming DID calls to be answered with DISA, configure
the system with a DISA DN. Incoming DID calls that map onto
the DISA DN are then routed to a line that has DISA.
In addition to public network connections, Norstar Modular
ICS can be integrated into an existing private network, or to
other Norstar or Meridian 1 systems to form a corporate
telecommunications network.
P0992638 03
You must have one E&M/DISA Trunk Cartridge to
Controlling system access / 89
Modular ICS 6.0 Installer Guide